feat: unified catalog endpoint and slug-based app navigation

Consolidate route catalog (agent-driven) and apps table (deployment-
driven) into a single GET /api/v1/catalog?environment={slug} endpoint.
Apps table is authoritative; agent data enriches with live health,
routes, and metrics. Unmanaged apps (agents without App record) appear
with managed=false.

- Add CatalogController merging App records + agent registry + ClickHouse
- Add CatalogApp DTO with deployment summary, managed flag, health
- Change AppController and DeploymentController to accept slugs (not UUIDs)
- Add AppRepository.findBySlug() and AppService.getBySlug()
- Replace useRouteCatalog() with useCatalog() across all UI components
- Navigate to /apps/{slug} instead of /apps/{UUID}
- Update sidebar, search, and all catalog lookups to use slug

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/api/queries/admin/apps.ts

@@ -92,9 +92,12 @@ export function useCreateApp() {
 export function useDeleteApp() {
   const qc = useQueryClient();
   return useMutation({
-    mutationFn: (id: string) =>
-      appFetch<void>(`/${id}`, { method: 'DELETE' }),
-    onSuccess: () => qc.invalidateQueries({ queryKey: ['apps'] }),
+    mutationFn: (slug: string) =>
+      appFetch<void>(`/${slug}`, { method: 'DELETE' }),
+    onSuccess: () => {
+      qc.invalidateQueries({ queryKey: ['apps'] });
+      qc.invalidateQueries({ queryKey: ['catalog'] });
+    },
   });
 }